Daniel Ek (co-founder of Spotify) and Sean Parker (Director at Spotify) just took the stage here at D10, with Walt Mossberg asking the two about the company's impact in America, negotiations with record labels and -- perhaps surprisingly -- its links with Apple. Outside of confirming that there's still around 10 million Spotify users in the States (with around three million of those being of the paid variety), the duo also confirmed that it's working daily to improve the catalog. Said Ek: "We're up to 18 million songs, growing at 10,0
